Thanks to foamy the fearsome, I am back, to not be an idiot and make my suggestion, I have 2 sales for my proof, what I bought the hat for, and what I sold it for listed below, enjoy. (P.S. sorry it's a bit old, I got lazy and may or may not have forgot about it for a while), I bought this unusual for 19 keys and sold it for 21. Proof:

Bought:

https://imgur.com/a/QvFJhLi (price bought for)

https://imgur.com/a/wceaT4E (proof of unusual)

Sold:

https://backpack.tf/profiles/76561198141754321#!/compare/1550966400/1551571200